The phrase "a clear lesson of" is correct and usable in written English.
It can be used when you want to emphasize a specific teaching or moral derived from an experience or situation.
Example: "The recent events serve as a clear lesson of the importance of teamwork in achieving success."
Alternatives: "an obvious lesson about" or "a distinct lesson regarding".
But these countries' need to be bailed out reflects their failure to learn a clear lesson of the 1998 Asian crisis: Fixed foreign exchange rates have a way of blowing up when the going gets tough.
Finally, a clear lesson of the recent period is that the world is too interconnected for nations to go it alone in their economic, financial, and regulatory policies.
If so, it could actually be a helpful opening toward new bipartisan coalitions on important legislation, especially because a clear lesson of the Obama years is that lasting policy change is only possible through legislation supported by members of both parties.
The Stratfor hack, in which Anonymous claimed to have joined forces with WikiLeaks, drove home a clear lesson about the era of ubiquitous "hactivism," or hacking as a form of protest.
In fact, a clear lesson from the Depression of the 1930s is that reducing deficits at a time of economic fragility undercuts recovery.
As events this week confirmed, the enterprise has been a clear lesson in the perils of gambling.In January the smart money was on Britain's first ever super-casino being given to Blackpool, a gaudy, bawdy Victorian seaside town in the north-west of England, which is in sore need of a dash of glamour.
The event was a clear lesson that the construction of the fort must not be delayed any further.
Each group of students had a clear lesson objective and completed their corresponding learning tasks.
It's a dramatic, entertaining tale, with a clear lesson: Corporations, universities and governments never tire of throwing good money at bad science.
